- A creatinine level > 2.0 mg/dL within seven days prior to index procedure. Evidence of an acute myocardial infarction within 72 hours of the intended treatment (defined as: Q wave or non-Q wave myocardial infarction having creatine kinase [CK] enzymes greater than or equal to 2 X the upper laboratory normal with the presence of a creatine kinase myocardial-band isoenzyme [CK-MB] elevated above the institution's upper limit of normal).